DHT11 HUMIDITY SENSOR
Categories : SERIES 14 Arduino Accessories And Microcontroller ,  Sensor And Accessories , 
DHT11 digital humidity sensor, can measured humidity 20 to 90%, modules has 3-pin and used one cable for responding and transmission. DH11 also can be a thermometer, with temperature range of 0 -50 C (but not popular for use). The humidity measurements are stored in a 16-bit registers and will require a microcontroller for processing and display.
Technical Specification